参考清洁发展机制(CDM)方法学,结合中国国情,分析干法生物天然气BECCS工程的项目边界、基准线排放量和项目活动排放量,并计算实际工程的温室气体减排量.结果表明,生物天然气BECCS工程碳减排潜力表现在以有序工程替代无序排放、生产天然气代替化石能源、生产有机肥替代化肥和从沼气中分离CO2并存储利用4个方面,各方面减排量在净减排量中占比分别为1.1%、41.0%、39.6%和18.3%.按构建的计算方法估算每吨干秸秆和每吨畜禽粪污的碳负排效益分别为1229 kg CO2e和275 kg CO2e.预计至2060年,生物天然气BECCS工程每年可贡献8.6亿t碳汇,可为中国碳中和目标实现贡献重要力量.
CARBON NEGATIVE BENEFIT EVALUATION ON DRY FERMENTATION BIOMETHANE BECCS PROJECT
Based on the CDM methodology,this study analyzes the project boundary,baseline emissions and project activity emissions of the BECCS biomethane project and calculates the existing engineering carbon emission reduction.The results show that GHG emission reduction potential of BECCS biomethane projects is demonstrated in four aspects,replacing emissions from random to order with engineering,producing natural gas to substitute fossil fuel,yielding organic fertilizer instead of chemical fertilizer and separating CO2 from biogas and storing it for utilization.The carbon negative benefits of the above four aspects account for 1.1%,41.0%,39.6%and 18.3%of the net emission reduction,respectively.The carbon negative emission benefits of dry straw and livestock manure were estimated to be 1229 kg CO2e/t and 275 kg CO2e/t,respectively.It is expected that the BECCS biomethane project will contribute up to 0.86 billion ton GHG emission reduction per year till 2060 and become midstream in achieving the carbon-neutral target in China.
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